Show a reply's steps, and catch up on a reply whose live push was missed

A reply that works through tools now shows its latest tool step under
"is thinking…" (not its closing note, which is the answer). While a reply
is due, the open conversation checks the session's latest messages every
few seconds (api/admin/bots/session-messages) and replays any it missed
as server:bot-message, so the thread, rail and unread all take it and the
thinking row can't stay up until a reload. MCP and custom tool steps read
in words ("Using Exa search (web search exa)").

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/bots-queue/describe-job-step.test.ts

@@ -48,10 +48,21 @@ describe("describeJobStep", () => {
                 tool_calls: [
                     { id: "a", name: "browser_navigate", arguments: "{}" },
                     { id: "b", name: "browser_click", arguments: "{}" },
-                    { id: "c", name: "some_mcp_tool", arguments: "{}" },
+                    { id: "c", name: "get_weather", arguments: "{}" },
                 ],
             })?.text,
-        ).toBe("Using the browser, Using some_mcp_tool");
+        ).toBe("Using the browser, Using get weather");
+    });
+
+    test("names an MCP server's tool in words", () => {
+        expect(
+            describeJobStep({
+                index: 0,
+                text: null,
+                candidate,
+                tool_calls: [{ id: "a", name: "exa_search__web_search_exa", arguments: "{}" }],
+            })?.text,
+        ).toBe("Using Exa search (web search exa)");
     });
 
     test("keeps the first line of a text-only turn, cut to one line", () => {

src/bots-queue/describe-job-step.ts

@@ -57,5 +57,21 @@ function firstLine({ text }: { text: string | null }) {
 function toolLabel({ name }: { name: string }) {
     const prefix = Object.keys(JobStepToolPrefixLabels).find((p) => name.startsWith(p));
 
-    return JobStepToolLabels[name] || (prefix && JobStepToolPrefixLabels[prefix]) || `Using ${name}`;
+    return JobStepToolLabels[name] || (prefix && JobStepToolPrefixLabels[prefix]) || `Using ${readableToolName({ name })}`;
+}
+
+/**
+ * A tool name in words: `get_weather` reads "get weather", and an MCP
+ * server's `<slug>__<tool>` reads "Exa search (web search exa)".
+ */
+function readableToolName({ name }: { name: string }) {
+    const words = (part: string) => part.replace(/_+/g, " ").trim();
+    const [server, ...rest] = name.split("__");
+    const tool = words(rest.join(" "));
+
+    if (!tool) return words(name);
+
+    const server_words = words(server || "");
+
+    return `${server_words.charAt(0).toUpperCase()}${server_words.slice(1)} (${tool})`;
 }